Botryosphaeriales » Botryosphaeriales genera incertae sedis

Vestergrenia

Vestergrenia Rehm, Hedwigia 40: 100 (1901).

Index Fungorum number: IF 5733; Facesoffungi number: FoF 11908, 24 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on leaves. Sexual morph: Ascostromata solitary, scattered, or in small groups, especially forming on leaf veins, superficial, subglobose or globose, black, coriaceous. Peridium composed of a single stratum, comprising 3–4 layers of brown pseudoparenchymatous cells of textura angularis/ globulosa. Pseudoparaphyses not reported. Asci 8–spored, bitunicate, broadly clavate to ovoid, with a long pedicel, apically rounded with an ocular chamber. Ascospores irregularly 2–3–seriate, hyaline, aseptate, ellipsoidal-ovoid. Asexual morph: Unknown (adapted from Liu et al. 2012).

 Type species: Vestergrenia nervisequia Rehm

Notes: Vestergrenia is characterised by solitary, scattered ascostromata, 8-spored, bitunicate, broadly clavate to ovoid asci and 2–3-seriate, hyaline, aseptate, ellipsoidal-ovoid ascospores. Luttrell (1973) transferred Vestergrenia to Dothideaceae based on distinct ascomata, broad clavate to ovoid asci which rest in small stalks of variable lengths and erect at different heights in the locule and unicellular ascospores. Vestergrenia differs from the type species of Dothidea, D. sambuci in having pulvinate ascostromata comprising several locules in an outer layer and two-celled ascospores (Schoch et al. 2009, Liu et al. 2012). Vestergrenia resembles members of Botryosphaeriaceae in having unicellular ascospores, broad clavate asci with distinct pedicels and brown ascomata with relatively thick-walled cells of textura angularis or globulosa. Vestergrenia is currently a distinct genus in Botryosphaeriaceae based on morphology. Molecular data is lacking for Vestergrenia. Fresh collections and DNA sequence data are needed to confirm the taxonomic placement of the genus.

 

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